改进冰川下排水模型中层流和湍流片流的表示方法

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Tim Hill, G. Flowers, Matthew J. Hoffman, Derek Bingham, M. Werder
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引用次数: 0

摘要

:冰川下水文模型难以再现与观测到的冰川下水压力和表面速度相一致的季节性排水模式。我们修改了冰川-沟道耦合排水模型中的标准片流参数化,以物理一致的方式,根据本地计算的雷诺数在层流和湍流之间平滑过渡("过渡 "模型)。我们将过渡模型与标准层流模型和湍流模型进行了比较,以评估片流参数化在理想化和现实强迫条件下协调观测水压和模拟水压的作用。与湍流模式相比,层流模式和过渡模式通过增加冬季水压和产生更明显的夏末水压最小值,改善了季节模拟。与层流模型相比,过渡模型在所有流态下都与其内部假设保持一致。基于
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Improved representation of laminar and turbulent sheet flow in subglacial drainage models
: Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet--channel subglacial drainage model to smoothly transition between laminar and turbulent flow based on the locally computed Reynolds number in a physically consistent way (the "transition" model). We compare the transition model to standard laminar and turbulent models to assess the role of the sheet-flow parameterization in reconciling observed and modelled water pressures under idealized and realistic forcing. Relative to the turbulent model, the laminar and transition models improve seasonal simulations by increasing winter water pressure and producing a more prominent late-summer water pressure minimum. In contrast to the laminar model, the transition model remains consistent with its own internal assumptions across all flow regimes. Based on the internal consistency of the
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来源期刊
Journal of Glaciology
Journal of Glaciology 地学-地球科学综合
CiteScore
5.80
自引率
14.70%
发文量
101
审稿时长
6 months
期刊介绍: Journal of Glaciology publishes original scientific articles and letters in any aspect of glaciology- the study of ice. Studies of natural, artificial, and extraterrestrial ice and snow, as well as interactions between ice, snow and the atmospheric, oceanic and subglacial environment are all eligible. They may be based on field work, remote sensing, laboratory investigations, theoretical analysis or numerical modelling, or may report on newly developed glaciological instruments. Subjects covered recently in the Journal have included palaeoclimatology and the chemistry of the atmosphere as revealed in ice cores; theoretical and applied physics and chemistry of ice; the dynamics of glaciers and ice sheets, and changes in their extent and mass under climatic forcing; glacier energy balances at all scales; glacial landforms, and glaciers as geomorphic agents; snow science in all its aspects; ice as a host for surface and subglacial ecosystems; sea ice, icebergs and lake ice; and avalanche dynamics and other glacial hazards to human activity. Studies of permafrost and of ice in the Earth’s atmosphere are also within the domain of the Journal, as are interdisciplinary applications to engineering, biological, and social sciences, and studies in the history of glaciology.
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